Military Commissions vs. Courts-Martial: Structure, Jurisdiction, and Key Differences

The two forums are easy to confuse because both are run by the military and both try criminal charges before a panel of officers. They are not, however, two versions of the same thing. A court-martial is the standing criminal court of the armed forces, trying its own members for offenses under the Uniform Code of Military Justice. A military commission is a separate, wartime tribunal that tries non-citizen enemy fighters for violations of the law of war. The cleanest way to keep them straight is to ask four questions of each system: who can it try, what law does it apply, what protections does the accused get, and where does an appeal go. The answers diverge at every step, and popular shorthands about the two being “basically the same” are wrong in ways that matter.

Who each forum can try

This is the dividing line everything else follows from. A court-martial has personal jurisdiction over persons subject to the UCMJ: active-duty service members, reservists on qualifying duty, certain retirees, and a narrow set of civilians accompanying the force. The accused at a court-martial is, with rare exception, a member of the United States military being judged under the code that governs that military.

A military commission, by contrast, may try only an “alien unprivileged enemy belligerent.” The statute (10 U.S.C. 948a, in Chapter 47A of Title 10) defines that as a person who is not a United States citizen, who has engaged in or purposefully and materially supported hostilities against the United States or its coalition partners, or who was part of al-Qaeda, and who is not a privileged belligerent entitled to prisoner-of-war status. The citizenship limit is not incidental; it is constitutional. A United States citizen, including a service member, cannot be routed into a military commission to strip away ordinary protections. A citizen accused of a law-of-war offense must be tried in an Article III federal court or, if a service member, by court-martial. The historic anchor for that limit is Ex parte Milligan (1866), which held that military tribunals cannot try civilians where the civilian courts are open and operating.

What law each forum applies

A court-martial applies the UCMJ, the punitive articles at 10 U.S.C. 877 through 934, and the procedural and evidentiary rules of the Manual for Courts-Martial: the Rules for Courts-Martial and the Military Rules of Evidence. The offenses are the familiar catalog of military crimes, from desertion to larceny to sexual assault.

A military commission applies a different body of substantive law: violations of the law of war, plus the specific offenses Congress listed at 10 U.S.C. 950t, such as murder in violation of the law of war, attacking civilians, taking hostages, perfidy, and several terrorism-related crimes. The terrorism additions are where the commission’s reach has been actively contested. In Hamdan v. United States (D.C. Cir. 2012), often called Hamdan II, the court held that material support for terrorism was not a recognized law-of-war offense at the time of the conduct and could not be prosecuted by commission on that theory, vacating a conviction built on it. The decision narrowed what a commission can charge for pre-statute conduct and illustrates a structural fragility courts-martial do not share: a court-martial applies a settled domestic criminal code, while a commission’s offense list has had to be defended, charge by charge, as genuinely part of the law of war.

What protections the accused gets

Both systems give the accused counsel, a panel, a presumption of innocence, and the right to present a defense. The differences are in the details that decide hard cases, and the gap narrowed but did not close after the Military Commissions Act of 2009 revised the original 2006 framework.

Hearsay is the clearest example. Under the Military Rules of Evidence at court-martial, hearsay is admitted only through defined exceptions, much as in federal civilian court. The Military Commission rules of evidence are broader: a commission may admit hearsay on advance notice if the judge finds it reliable and probative. That latitude reflects a practical reality of cases built on foreign witnesses and battlefield intelligence, but it gives the commission accused less of the confrontation protection a court-martial accused keeps.

Classified evidence is the second major difference. Both forums use a framework modeled on the Classified Information Procedures Act, allowing the government to substitute unclassified summaries for sensitive material. The practical effect differs because of who the accused is. A service member at court-martial typically holds or can be granted a clearance, so the accused can often see the evidence through cleared counsel. A commission defendant is an alien detainee who cannot obtain a clearance, so the accused may be excluded from portions of the proceeding and may receive only summaries, while cleared defense counsel review the underlying material. That structural exclusion of the accused from the evidence against him is the recurring source of due-process litigation in the commissions.

The voting rule that is not “the same”

A common claim is that a commission convicts on the same vote as a court-martial. It does not, and the error runs in both directions. A military commission convicts on a two-thirds vote of the members under 10 U.S.C. 949m(a). A court-martial no longer uses two-thirds; for offenses after the Military Justice Act of 2016 took effect on 1 January 2019, conviction requires a three-fourths concurrence of the members under Article 52, with fixed panels of eight (or twelve in a capital case) at a general court-martial. So the commission’s conviction threshold is actually lower than the modern court-martial’s. The two systems converge only at the top of the scale: a death sentence requires a unanimous vote in both, under 10 U.S.C. 949m(b)(2)(D) for commissions and Article 52a for courts-martial. The “two-thirds, same as a court-martial” line carries forward a court-martial rule that was replaced years ago.

Where an appeal goes

The appellate paths run through entirely separate courts, and this is one of the sharpest structural contrasts.

A court-martial conviction is reviewed first by the service Court of Criminal Appeals under Article 66, then by the Court of Appeals for the Armed Forces, a court of five civilian judges serving fifteen-year terms, and finally, by certiorari, by the Supreme Court under 28 U.S.C. 1259. The review stays inside the military justice system until it reaches the Supreme Court.

A military commission conviction goes to the United States Court of Military Commission Review under 10 U.S.C. 950f, a court of military and civilian judges, and from there to the United States Court of Appeals for the District of Columbia Circuit, which has exclusive jurisdiction over commission appeals under 10 U.S.C. 950g, and then to the Supreme Court by certiorari. The civilian appellate court is therefore different: the D.C. Circuit for commissions, the Court of Appeals for the Armed Forces for courts-martial. The two ladders touch only at the Supreme Court at the top.

How the modern system came to look this way

Military commissions are old, used to try spies and enemy fighters from the Revolutionary War through the Civil War conspirators and the World War II saboteurs in Ex parte Quirin (1942). The modern system was reshaped by litigation after September 11, 2001. President Bush first authorized commissions by military order, but in Hamdan v. Rumsfeld (2006) the Supreme Court struck that structure down, holding the commissions were not authorized by Congress and did not comply with the UCMJ or the Geneva Conventions. Congress responded with the Military Commissions Act of 2006, supplying the missing statutory authority, then amended it through the Military Commissions Act of 2009, which tightened the rules on coerced statements and moved commission procedure closer to court-martial procedure. A second decision sets the floor: in Boumediene v. Bush (2008), the Court held that Guantanamo detainees have a constitutional right to seek habeas corpus in federal court, and that the part of the MCA stripping that jurisdiction was an unconstitutional suspension of the writ. That habeas check runs alongside the commission process and has no parallel in the court-martial system, because court-martial defendants are already inside the constitutional order as service members.

The September 11 prosecution of Khalid Sheikh Mohammed and co-defendants shows the comparison in motion. Charged years ago and still in pretrial litigation, the case has been consumed largely by disputes over evidence tied to the defendants’ earlier CIA detention and over classified-evidence procedures, the very features that distinguish a commission from a court-martial. A pretrial agreement meant to resolve the case without a death-penalty trial was voided by the D.C. Circuit in a divided July 2025 decision, after which the matter was pursued toward the Supreme Court, traveling a CMCR-to-D.C.-Circuit path no court-martial would take.

Frequently asked questions

Can a U.S. citizen ever be tried by a military commission?

No. The Military Commissions Act limits commission jurisdiction to an “alien unprivileged enemy belligerent,” and “alien” by definition excludes United States citizens. A citizen accused of conduct that could otherwise be a law-of-war offense must be tried in a civilian Article III federal court, or, if the person is a service member, by court-martial under the UCMJ. The limit reflects the constitutional guarantees that attach to citizens, including jury trial, which a commission does not provide, and it traces to Ex parte Milligan (1866).

If a commission convicts on two-thirds and a court-martial on three-fourths, which gives the accused more protection at the verdict stage?

On the bare voting math, the court-martial requires a larger majority to convict, so its threshold is the more demanding of the two for the government. That number is not the whole picture, since the systems also differ on evidence rules, access to classified material, and panel makeup. But the frequently misstated point is that the conviction votes are not identical, and the two systems align only on a death sentence, which requires unanimity in both.

Sources

• 10 U.S.C. 948a, Definitions (alien unprivileged enemy belligerent); 10 U.S.C. Ch. 47A, Military Commissions (law.cornell.edu/uscode/text/10/948a; uscode.house.gov, Title 10 Chapter 47A)
• 10 U.S.C. 950t, Crimes triable by military commission; 10 U.S.C. 949m, Number of votes required (law.cornell.edu/uscode/text/10/950t; uscode.house.gov, section 949m)
• 10 U.S.C. 950f and 950g, Review by the Court of Military Commission Review and the D.C. Circuit (uscode.house.gov, sections 950f, 950g)
• 10 U.S.C. 852 (Article 52), votes required at courts-martial; 10 U.S.C. 866 (Article 66) and 28 U.S.C. 1259, court-martial appellate review (law.cornell.edu/uscode/text/10/852)
• Hamdan v. Rumsfeld, 548 U.S. 557 (2006); Boumediene v. Bush, 553 U.S. 723 (2008) (supreme.justia.com)
• Hamdan v. United States, 696 F.3d 1238 (D.C. Cir. 2012) (law.justia.com)

Disclaimer

This article is for general informational purposes only and is not legal advice. It describes military law and matters of public record, does not address any individual case, and does not create an attorney-client relationship.